The decompression lever on a 1955 Royal Enfield 350 motorcycle is used to assist in starting the bike by reducing compression in the engine. Here's a step-by-step guide on how to use the decompression lever:
Before starting the motorcycle, make sure the ignition is turned on, the fuel valve is open, and the transmission is in neutral.
Locate the decompression lever on the handlebar of the Royal Enfield 350. It is typically located on the left side, near the clutch lever.
Pull the decompression lever towards you with your left hand. This action will engage the decompression mechanism, which temporarily opens one or both of the exhaust valves, reducing the compression inside the engine.
With the decompression lever pulled, use your right hand to kick-start the motorcycle. Use a firm and deliberate motion on the kick-start lever to engage the engine. Since the decompression lever is engaged, the reduced compression will make it easier to kick-start the engine.
Once the engine fires up and starts running, release the decompression lever slowly to disengage it. The lever should return to its original position, allowing the exhaust valves to close and restore normal engine compression.
Allow the motorcycle to warm up for a few minutes before riding. During this time, the decompression lever should be in its original position, not engaged.
It's important to note that the decompression lever is primarily used for starting the motorcycle and should not be used while riding. Its purpose is to make the kick-starting process easier by reducing engine compression temporarily. Once the engine is running, the lever should be released to restore normal compression and ensure proper engine performance.
Please keep in mind that this guide is based on a general understanding of vintage motorcycles and the usage of a decompression lever. If you are unsure or need specific information about your 1955 Royal Enfield 350, consulting the motorcycle's manual or seeking guidance from a knowledgeable mechanic who specializes in vintage motorcycles is recommended.